Uh, not from what I can see... I've started back up recently, and there seems to be fewer people populating the major cities these days (mainly late at night or early morning). However middle of the day, there are plenty about, and generally on the verge of a new expansion there are fewer people. When the expansion releases however you'll see tons coming back, especially at midnight when it's released. Everyone will be clamoring to check out all the new stuff, and I guarantee a surge in players from that point on.